This episode is considered non-canon, and the events featured are not part of the timeline of the series' continuity.
I, Carumbus is the second episode of Season 32,[2] originally produced as an episode of Season 31.
Plot
At a museum exhibit of Ancient Rome, Marge and Homer get into an argument about Homer's lack of ambition. They then imagine a Roman version of what would happen if Homer was more career-driven.
Full Story
At a museum exhibit about Ancient Rome, Homer complains that he should have gone to a career improvement at the power plant. Marge gets rattled and says that Homer should have more ambition. A fight begins, but a museum worker soon interrupts telling about Obesus, who had a big ambition.